Este test está cronometrado.
Tienes 10 minutos para completar 18 preguntas de este test.
Choose which rule the following suggests: Gold and Iron both are metals but differ in properties such as color and luster.
All matter are made up of atoms
Elements may have the same atomic mass but has properties that differ because of isotopes.
Atoms from different elements different from each other
Atoms CAN be destroyed in chemical reactions.
Cells: ; Tissue: Matter
Each element has a unique average mass; however, what is shown on the Periodic Table is the atomic mass not the average
Cathode Rays have identical properties regardless of the element used
(Rutherford's Gold Foil Experiment)The partcles shot by the emitter were alpha or positive particles
Conclusions of Rutherford's Gold Foil Experiment
Atoms were mostly empty space
The nucleus was a positively charged, dense, and small part of the atom
The nucleus was binded by the nuclear binding force
, which have a positive charge, and Neutrons, which have a charge, contribute majorly to the mass of the atom while electrons does nothing to the mass.
The nucleus with the nuclear binding force, holds the nucleus together
Number of + Number of = Mass Number
Number of equal to the atomic number which is to each element
A = ? Z = ? X = ?
A= mass number Z = Atomic Number X = element symbol
A= Atomic number Z = Mass Number X = element symbol
A= mass number Z = Atomic Mass X = element symbol
Mass number = Atomic Weight found in the Periodic Table of Eements
Isotopes ; Ions
Atoms of same element with different amount of neutrons ; atoms that have positive or negative charge
Atoms of same element with different amount of electrons ; atoms that have neutral charge
Atoms with different amount of neutrons ; atoms that have positive or negative charge
An atom with the number of electrons not equal to the number of protons is an ion
To calculate for the , you need to multiply each of the atomic masses of each with its respective abundance which you will need to . The sum is the average atomic mass of the element.
To calculate for the fractional abundance, you will need to multiply the %abundance by 100
Formula for Neutron
Atomic number-Mass Number
Mass number-number of protons
N=Z-A
